summaryrefslogtreecommitdiffstats
path: root/arch/ppc64/oprofile/common.c
blob: e5f572710aa07bb2e912ec8c58f2a6cd2cac9132 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/*
 * Copyright (C) 2004 Anton Blanchard <anton@au.ibm.com>, IBM
 *
 * Based on alpha version.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#include <linux/oprofile.h>
#include <linux/init.h>
#include <linux/smp.h>
#include <linux/errno.h>
#include <asm/ptrace.h>
#include <asm/system.h>
#include <asm/pmc.h>
#include <asm/cputable.h>
#include <asm/oprofile_impl.h>

static struct op_ppc64_model *model;

static struct op_counter_config ctr[OP_MAX_COUNTER];
static struct op_system_config sys;

static void op_handle_interrupt(struct pt_regs *regs)
{
	model->handle_interrupt(regs, ctr);
}

static int op_ppc64_setup(void)
{
	int err;

	/* Grab the hardware */
	err = reserve_pmc_hardware(op_handle_interrupt);
	if (err)
		return err;

	/* Pre-compute the values to stuff in the hardware registers.  */
	model->reg_setup(ctr, &sys, model->num_counters);

	/* Configure the registers on all cpus.  */
	on_each_cpu(model->cpu_setup, NULL, 0, 1);

	return 0;
}

static void op_ppc64_shutdown(void)
{
	release_pmc_hardware();
}

static void op_ppc64_cpu_start(void *dummy)
{
	model->start(ctr);
}

static int op_ppc64_start(void)
{
	on_each_cpu(op_ppc64_cpu_start, NULL, 0, 1);
	return 0;
}

static inline void op_ppc64_cpu_stop(void *dummy)
{
	model->stop();
}

static void op_ppc64_stop(void)
{
	on_each_cpu(op_ppc64_cpu_stop, NULL, 0, 1);
}

static int op_ppc64_create_files(struct super_block *sb, struct dentry *root)
{
	int i;

	/*
	 * There is one mmcr0, mmcr1 and mmcra for setting the events for
	 * all of the counters.
	 */
	oprofilefs_create_ulong(sb, root, "mmcr0", &sys.mmcr0);
	oprofilefs_create_ulong(sb, root, "mmcr1", &sys.mmcr1);
	oprofilefs_create_ulong(sb, root, "mmcra", &sys.mmcra);

	for (i = 0; i < model->num_counters; ++i) {
		struct dentry *dir;
		char buf[3];

		snprintf(buf, sizeof buf, "%d", i);
		dir = oprofilefs_mkdir(sb, root, buf);

		oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
		oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
		oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
		/*
		 * We dont support per counter user/kernel selection, but
		 * we leave the entries because userspace expects them
		 */
		oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
		oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
		oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
	}

	oprofilefs_create_ulong(sb, root, "enable_kernel", &sys.enable_kernel);
	oprofilefs_create_ulong(sb, root, "enable_user", &sys.enable_user);
	oprofilefs_create_ulong(sb, root, "backtrace_spinlocks",
				&sys.backtrace_spinlocks);

	/* Default to tracing both kernel and user */
	sys.enable_kernel = 1;
	sys.enable_user = 1;

	/* Turn on backtracing through spinlocks by default */
	sys.backtrace_spinlocks = 1;

	return 0;
}

int __init oprofile_arch_init(struct oprofile_operations *ops)
{
	if (!cur_cpu_spec->oprofile_model || !cur_cpu_spec->oprofile_cpu_type)
		return -ENODEV;

	model = cur_cpu_spec->oprofile_model;
	model->num_counters = cur_cpu_spec->num_pmcs;

	ops->cpu_type = cur_cpu_spec->oprofile_cpu_type;
	ops->create_files = op_ppc64_create_files;
	ops->setup = op_ppc64_setup;
	ops->shutdown = op_ppc64_shutdown;
	ops->start = op_ppc64_start;
	ops->stop = op_ppc64_stop;

	printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
	       ops->cpu_type);

	return 0;
}

void oprofile_arch_exit(void)
{
}